Correlations between the calculated stacking fault energy and the plasticity mechanisms in Fe-Mn-C alloys
Correlations between the calculated stacking fault energy and the plasticity mechanisms in Fe-Mn-C alloys
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DOI：
10.1016/j.msea.2004.01.059
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发表时间：
2004-12-15
期刊：
影响因子：
6.4
通讯作者：
Guelton, N
中科院分区：
文献类型：
--
作者：
Allain, S;Chateau, JP;Guelton, N
提出了一种估算不同温度下Fe-Mn-C奥氏体合金层错能的模型。它解释了奥氏体相变过程中各元素的吉布斯能的变化，以及它们之间的相互作用。同时考虑了反铁磁向顺磁转变所产生的吉布斯能。所需的数据已从文献中获得。结果表明，超临界温度随温度的升高而减小，在奥氏体尼尔温度以下有一饱和。计算结果与Schumann提出的力学和热马氏体相变极限一致。塑性机制取决于SFE。机械马氏体相变发生在18MJ/m(2)以下，孪晶在12到35MJ/m(2)之间，与拉伸试验和在77、293和693K(C)2004 Elsevier B.V.下观察到的Fe-22wt.%Mn-0.6wt.%C合金的变形组织一致。
A model is proposed for the evaluation of the stacking fault energy (SFE) in Fe-Mn-C austenitic alloys, at different temperatures. It accounts for the variation of the Gibbs energy of each element during the austenite to epsilon martensite transformation, plus their interactions. The Gibbs energy due to the antiferromagnetic to paramagnetic transition is also taken into account. The required data have been obtained from the literature. The result shows a decrease of the SFE with temperature, with a saturation below the austenite Neel temperature. The result agrees with the mechanical and thermal martensitic transformation limits proposed by Schumann. The plasticity mechanisms depend on the SFE. The mechanical martensitic transformation occurs below 18 mJ/m(2), and twinning between 12 and 35 mJ/m(2), in agreement with the tensile tests and the deformation microstructures observed in an Fe-22 wt.% Mn-0.6 wt.% C alloy at 77, 293 and 693 K. (C) 2004 Elsevier B.V. All rights reserved.